In this paper, an a priori signal-to-noise ratio (SNR) estimator with a modified sigmoid gain
function is proposed for real-time speech enhancement. The proposed sigmoid gain function
has three parameters, which can be optimized such that they match conventional gain
functions. In addition, the joint temporal dynamics between the SNR estimate and the
spectral gain function is investigated to improve the performance of the speech
enhancement scheme. As the widely-used decision-directed (DD) a priori SNR estimate has …